Here are 2 rear camera options i have found made for bikes...I am sure you can mod one for much less.
Bike Eye
4Kam VU - Wireless reversing camera and rear view cam systems
Ant Racing Rearview Camera System
Ant Racing Rear View Camera System - Tobefast
ANT racing also makes one that has GPS as well. I will add more as I find them might be an interesting option to getting rid of the mirrors
Bike Eye
4Kam VU - Wireless reversing camera and rear view cam systems
Ant Racing Rearview Camera System
Ant Racing Rear View Camera System - Tobefast
ANT racing also makes one that has GPS as well. I will add more as I find them might be an interesting option to getting rid of the mirrors